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Health Checks in Load Balancing
- Purpose: Allow the load balancer to determine if target instances are healthy and able to serve traffic.
- How it works:
- The load balancer periodically sends requests to a specific port and path (e.g.,
/health). - A healthy target typically responds with HTTP 200 OK (or other configured success codes).
- If the target fails to respond within the configured timeout or returns an error status code, it is marked unhealthy.
- Impact:
- Unhealthy targets are automatically removed from the load balancer’s rotation until they pass health checks again.
- Ensures traffic is only sent to healthy instances, improving availability and user experience.